Iphone 4 just turns itself off for maybe 2 mins then turns on

Any ideas.. To be honest wish I had never bothered to change it... think its rubbish

Hello, crazydaisy88. 
Thank you for the question.  You may find this article helpful in troubleshooting your issue.
iOS: Not responding or does not turn on
http://support.apple.com/kb/TS3281
If the issue persists, see step 6 of the article.
Regards,
Jason H.

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